EP1613988A1 - Folie und optisches sicherungselement - Google Patents
Folie und optisches sicherungselementInfo
- Publication number
- EP1613988A1 EP1613988A1 EP04726432A EP04726432A EP1613988A1 EP 1613988 A1 EP1613988 A1 EP 1613988A1 EP 04726432 A EP04726432 A EP 04726432A EP 04726432 A EP04726432 A EP 04726432A EP 1613988 A1 EP1613988 A1 EP 1613988A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- liquid crystal
- crystal material
- film
- diffractive structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 56
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 82
- 239000000463 material Substances 0.000 claims abstract description 81
- 230000010076 replication Effects 0.000 claims abstract description 43
- 239000010410 layer Substances 0.000 claims description 254
- 239000010408 film Substances 0.000 claims description 53
- 230000010287 polarization Effects 0.000 claims description 25
- 239000011888 foil Substances 0.000 claims description 15
- 239000010409 thin film Substances 0.000 claims description 13
- 238000004049 embossing Methods 0.000 claims description 10
- 239000004922 lacquer Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000010030 laminating Methods 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 4
- 238000000149 argon plasma sintering Methods 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 28
- 239000012790 adhesive layer Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000000758 substrate Substances 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 229920000106 Liquid crystal polymer Polymers 0.000 description 5
- 230000001419 dependent effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 125000006850 spacer group Chemical group 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 150000001252 acrylic acid derivatives Chemical class 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000020 Nitrocellulose Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000007774 anilox coating Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 150000004770 chalcogenides Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/328—Diffraction gratings; Holograms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3016—Polarising elements involving passive liquid crystal elements
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/0005—Adaptation of holography to specific applications
- G03H1/0011—Adaptation of holography to specific applications for security or authentication
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H1/0252—Laminate comprising a hologram layer
- G03H1/0256—Laminate comprising a hologram layer having specific functional layer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
- G03H1/041—Optical element in the object space affecting the object beam, not otherwise provided for
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/18—Particular processing of hologram record carriers, e.g. for obtaining blazed holograms
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
- G07D7/0032—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements using holograms
-
- B42D2033/26—
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H1/024—Hologram nature or properties
- G03H1/0244—Surface relief holograms
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2250/00—Laminate comprising a hologram layer
- G03H2250/38—Liquid crystal
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24612—Composite web or sheet
Definitions
- the invention relates to a substrate, in particular a film, embossing film, laminating film or sticker film, which has a carrier layer and a replication layer.
- the invention further relates to an optical security element for securing banknotes, credit cards and the like, which has a replication layer.
- a polyimide layer is usually aligned by a mechanical brushing process.
- liquid crystal polymers are applied to the orientation layer, which then align with this orientation layer.
- EP 1 227 347 describes the alignment of LCPs on a photopolymer layer.
- Orientation layer is printed, which consists of a photopolymer, which can be aligned by the irradiation with polarized light in a certain orientation direction.
- This layer is now irradiated with polarized light.
- a Layer of a liquid crystal material applied to the alignment layer and created conditions under which aligns the liquid crystal material.
- the liquid crystal layer is cured by means of UV light.
- orientation layers it is also possible for two orientation layers to be applied one above the other to a substrate.
- the two layers are in each case irradiated with differently polarized light and then fixed, so that orientation layers with different orientation result, which are arranged one above the other.
- the invention is based on the object to improve the production of optical security elements and / or decorative films.
- a substrate in particular a film, embossing film, laminating film or sticker film, which comprises a carrier layer, a
- the task will continue from an optical Security element for securing banknotes, credit cards and the like dissolved, which has a replication layer and a layer of a liquid crystal material which is applied to the replication layer, and in which the layer of the liquid crystal material facing surface of the replication layer, a diffractive structure for the orientation of the liquid crystal material is embossed, which has at least two partial regions with different orientation directions of the embossed structure.
- the invention makes it possible to align liquid crystals in one area in a targeted manner and with high precision in different orientation directions, whereby it is possible to produce various types of optical security features which are only visible under polarizers and thus have obvious but readily detectable properties. As a result, a high degree of protection against counterfeiting can be achieved. Furthermore, the manufacturing process is simplified, accelerated and cheapened. For example, when using photopolymers, it is necessary to carry out numerous, complex exposure steps and / or to produce elaborate masks.
- liquid crystals in monomeric and polymeric form can be used as liquid crystal material.
- Particularly tamper-proof optical security features can be achieved in that the diffractive structure has a coated with the layer of a liquid crystal material region in which the orientation direction of the structure changes steadily. If a security feature generated by means of such a diffractive structure is viewed through a polarizer with, for example, a rotating polarization direction, then it is possible due to the linearly changing polarization direction of the security element different well-recognizable security features, such as motion effects generate.
- Layer of a liquid crystal material are coated to provide with different orientation directions of the diffractive structure.
- the diffractive structure has a first area for orientation of liquid crystal material covered by the layer of a liquid crystal material, and that the diffractive structure has a second area for producing a diffractive optical effect, for example for producing a diffractive effect Hologram or a kinoform.
- a security feature based on polarization effect and a security feature based on a diffraction effect are generated side by side in one and the same layer. This allows a security element with a high degree of security against counterfeiting paired with low production costs. By means of one and the same process step, the basis for two different optical effects can be laid thereby.
- the polarization representation generated in the first region and a holographic representation generated in the second region to form a complementary representation.
- the holographic representation shows a tree whose leaves are formed by the polarization representation.
- the content of the polarization representation and the holographic representation complement each other contentwise such that a change of one of the representations is immediately visible from the other representation. This further increases the security against counterfeiting.
- this second structure has a higher spatial frequency than the first structure and / or has a greater profile depth than the first structure.
- Particularly good orientation effects can be achieved here if the spatial frequency of the second structure is selected to be at least ten times higher than the spatial frequency of the first structure or if the spatial frequency of the second structure is greater than 2500 lines per mm.
- the combination with an isotropic matt structure has the advantage that any refractive index difference between replication layer and liquid crystal material or veils or shadow effects caused by impurities in the orientation of the liquid crystals are compensated and are no longer visible. Also, an additional copy protection is created.
- the scattering of the polarized light prevents the generation of a sufficiently defect-free orientation layer by a photopolymer-based exposure method.
- the layer of a liquid-crystal material covers the diffractive structure only partially in a pattern. This results in more design options. It has proved to be advantageous to provide a protective lacquer layer which covers the layer of a liquid crystal material.
- the film has a further layer with a further optically active diffractive structure or a further effective diffractive structure is embossed on the surface of the replication layer facing away from the layer of a liquid crystal material.
- this optically effective diffractive structure it is possible to achieve further combinations of diffraction-optical security features and security features that can only be recognized in polarized light. If the further optically effective diffractive structure superimposes the diffractive structure acting as an orientation layer in certain regions, an overlay of such effects can be achieved. Furthermore, by content-accurate arrangement of the two diffractive structures, a substantive supplement to the information optically displayed by these structures can be achieved.
- the film additionally has a thin-film layer system and / or other security features, such as partial demetallization.
- a reflective layer in particular a metallic layer or an HRI layer, so that the security element can be designed as a reflective or partially reflective security element.
- (partial or full area) cholesteric liquid crystal layers can serve as a reflector.
- an optical fuse element as a two-part fuse element, in which a subelement has the replication layer and the layer of a liquid crystal material and in which a second subelement has a polarizer for checking the security feature generated by the layer of a liquid crystal material , This makes it possible for the user, by viewing the first sub-element via the second sub-element, to check the security feature, which is invisible to the naked eye.
- both partial elements have a layer of a liquid crystal material which is applied to a respective replication layer into which a diffractive structure for orientation of the liquid crystal material is embossed and the at least two partial regions with different orientation directions of the embossed structure having.
- the security elements of the two sub-elements complement each other, so that it is possible for the user, by viewing the first sub-element via the second sub-element, to check the security feature of the first sub-element that is invisible to the naked eye.
- Fig. 1 shows a schematic representation of a security document, which is provided with an optical fuse element according to the invention.
- Fig. 2 shows a section through an embossing film according to the invention.
- Fig. 3 shows a section through a sticker film according to the invention.
- FIG. 4 shows a schematic sectional view of an optical security element according to the invention applied to a value document.
- Fig. 5a shows a plan view of an inventive optical fuse element.
- FIG. 5b shows a sectional view of the securing element according to FIG. 5a.
- FIGS. 6a to 6e show schematic representations of diffractive structures for orientation of liquid crystal molecules.
- Fig. 7 shows a sectional view of a film according to the invention according to a first embodiment.
- Fig. 8 shows a sectional view of a film according to the invention for a second embodiment.
- Fig. 9 shows a sectional view of an optical fuse element according to the invention for a third embodiment.
- a security document 1 which consists of a carrier element 13 and an optical security element consisting of two sub-elements 11 and 12.
- the security document 1 is, for example, a banknote, a pass, a ticket or a software certificate.
- Carrier element 13 consists for example of paper or of a flexible plastic material.
- the subelement 12 consists of a polarizer, which is embedded in a window of the carrier element 13 or which is applied to a transparent region of the carrier element 13. By bending the carrier element 13, it is possible for a user to view the partial element 11 through the partial element 12 and thus make visible polarization effects generated by the partial element 11.
- the support member 13 may also consist of an inflexible material, so that the security document 1, for example, a
- the carrier element 13 consists of a conventional plastic card, on the front side, for example, the name of the cardholder is imprinted.
- this plastic card it is possible for this plastic card to have a transparent region in the region of the optical security element so that the optical fuse element can be a transmissive optical fuse element.
- FIGS. 2 to 9 which can also be used as partial element 11 according to FIG.
- FIG. 2 shows a stamping foil 2 with six layers 21, 22, 23, 24, 25 and 26.
- the layer 21 is a carrier layer, for example, has a thickness of about 12 microns to 50 microns and is formed by a polyester film.
- the layers 22, 23, 24, 25 and 26 form the transfer layer of the stamping foil 2.
- the layer 22 is a release or protective lacquer layer, which preferably has a thickness of about 0.3 to 1.2 ⁇ m. This layer could also be dispensed with.
- the layer 23 is a replication layer into which diffractive structures can be impressed by means of an embossing tool.
- the replication layer 23 here preferably consists of a transparent, thermoplastic plastic material which can be applied, for example, by a printing process.
- the replication lacquer in this case has the following composition, for example:
- the support layer 21 consists for example of a PET film of 19 .mu.m thickness, to which the above-mentioned replication lacquer is applied with a line screen gravure roll, with a coating weight of 2.2 g / m 2 after drying. Drying takes place in a drying tunnel at a temperature of 100 to 120 ° C.
- the diffractive structure 27 is then impressed into the layer 23 at about 130 ° C. by means of a die, for example consisting of nickel.
- a die for example consisting of nickel.
- the matrix is preferably heated electrically.
- the die may be cooled again.
- the replication lacquer hardens by crosslinking or in some other way.
- the layer 24 is a layer of liquid crystal (LC) material.
- the layer 24 preferably has a thickness of 0.5 ⁇ m to 5 ⁇ m.
- liquid crystal materials having desired optical characteristics are usable. Examples include liquid crystal materials of the OPALVA ⁇ series from Vantico AG, Basel, CH.
- the liquid crystals are aligned on a layer 23 serving as an orientation layer while supplying some heat.
- UV curing of the liquid crystal material is performed to fix the orientation of the liquid crystal molecules.
- the printed layer of a solvent-containing liquid crystal material is subjected to a drying process and the liquid crystal molecules orient themselves during the evaporation of the solvent according to the diffractive structure 27. It is also possible that solvent-free liquid crystal material is applied by a printing process and is fixed after orientation by crosslinking.
- the layer 25 is a protective lacquer layer which is applied to the layer 24, for example by a printing process.
- the layer 25 could also be dispensed with.
- the layer 25 has, for example, a thickness of 0.5 ⁇ m to 3 ⁇ m and preferably consists of UV-crosslinkable acrylates and abrasion-resistant thermoplastic acrylates.
- the layer 26 is an adhesive layer, which consists for example of a thermally activated adhesive.
- the embossing foil 2 is applied with the transfer layer formed by the layers 21 to 26 first on the security document or the object to be secured and then under the action of heat against the security document or pressed the object to be secured.
- the transfer layer connects via the adhesive layer 26 with the corresponding surface of the security document or the object to be secured.
- the transfer layer is detached from the carrier layer 21.
- the detachment of the transfer layer from the carrier layer 13 is facilitated here by the preferably waxy release layer 22.
- the stamping foil 2 may also be a different kind of foil, for example a laminating foil. In this case, the layer 22 would have to be replaced by another layer which, if appropriate, improves the adhesion to the carrier.
- FIG. 3 shows a sticker film 3 consisting of four layers 31, 32, 33 and 34.
- the layer 31 is a carrier layer, which consists for example of a transparent, partially transparent or non-transparent polyester material having a thickness of 12 .mu.m to 15 .mu.m.
- the layer 32 is a replication layer into which a diffractive structure 35 is embossed.
- the layer 33 is a layer of liquid crystal material and the layer 34 is a resist layer.
- the layers 32, 33 and 34 may in this case be configured like the layers 23, 24 and 25 according to FIG. 2. The layer 34 could also be dispensed with.
- Fig. 4 shows an optical fuse element 4 and a substrate 46, on which the optical fuse element 4 is applied.
- the substrate 46 is, for example, a security document to be secured, for example the base element 13 according to FIG.
- the optical security element 4 has five layers 41, 42, 43, 44 and 45.
- the layer 4 is a protective lacquer layer.
- the layer 42 is a replication layer into which a diffractive structure 46 is embossed.
- the layer 43 is a layer of a liquid crystal material
- the layer 44 is a protective lacquer layer
- the layer 45 is an adhesive layer which glues the layer 44 to the substrate 46.
- the layers 41, 42, 43, 44 and 45 are configured, for example, like the layers 21, 22, 23, 24, 25 and 26 of FIG. 2. Further possibilities will now be described with reference to FIG. 5 as to how the diffractive structures 27, 35 and 46 are to be shaped.
- FIG. 5 shows an optical security element 6 which can be divided into a plurality of regions 61, 62 and 63.
- the areas 61, 62 and 63 are embossed over their entire surface with a diffractive structure.
- the diffractive structure consists, for example, of a multiplicity of parallel grooves arranged side by side, which enable an orientation of liquid crystal molecules.
- these grooves have a spatial frequency of 300 to 3000 lines / mm and a profile depth of 200 nm to 600 nm. Even shallower depths are conceivable, for example in the range of 50 nm.
- Particularly good orientation results can be achieved by diffractive structures whose spatial frequency in the Range of 1000 to 3000 lines / mm are settled.
- the longitudinal direction of these grooves represents the orientation direction of the diffractive structure.
- the orientation direction of the diffractive structure is different in the regions 61, 62 and 63.
- the region 61 has a plurality of parallel horizontally-arranged grooves
- the region 62 has a plurality of vertically arranged parallel grooves
- the region 63 has a plurality of parallel grooves tilted 30 ° C from the vertical.
- the diffractive structure is thus horizontally oriented in the region 61, oriented vertically in the region 62 and oriented in the region 63 at 30 ° C. with respect to the vertical.
- the diffractive structure is formed by a plurality of grooves whose orientation direction varies along the grooves.
- the direction of orientation of the diffractive structure along the horizontal or vertical axis in the region 61 may change continuously.
- motion effects or gray scale gradients can be achieved.
- optical fuse element 6 a is also possible that the optical fuse element 6 a
- the optical fuse element 6 thus has a replication layer 65, a layer of a liquid crystal material 66, and an adhesive layer 67.
- a diffractive structure 68 is impressed in the replication layer 65.
- the replication layer 65, the layer 66 and the adhesive layer 67 are configured, for example, like the layers 23, 24 and 26 of FIG. 2.
- the layer 66 is, as shown in Fig. 6, only partially in the
- the diffractive structure 68 is not coated with liquid crystal material, so that in these regions no polarization effect is achieved by oriented liquid crystal molecules. Thus, a polarization representation is generated only in the region 62. In the areas 61 and 63, on the other hand, the optical diffraction effect brought about by the diffractive structure 68 comes into play.
- optical representation of the optical security element 6 which is composed of a polarization representation in the region 62 and two flanking holographic representations in the regions 61 and 63.
- these holographic representations and the polarization representation are content-complementary representations, the For example, form a common word or a common graphical representation.
- two or more of the regions 61 to 63 may be arranged next to one another in any desired representation.
- the representation of a holographic tree is conceivable, the leaves of which are formed by polarization representations and thus can be seen only when viewed in polarized light or a polarizer.
- FIGS. 6a to 6e show schematic representations of such diffractive structures 51 to 55.
- the diffractive structure 51 is an additive superposition of a fine structure, such as a zeroth-order diffraction structure, and a microscopically fine light-scattering coarse structure.
- the microscopically fine light scattering coarse structure is a structure of the group of isotropic or anisotropically scattering matt structures, of kinoforms or of Fourier holograms.
- the diffractive structures 52 to 55 each have a visible incident light diffractive structure with a profile height whose relief function is a superimposition of a low-frequency grating structure G (x, y) with a high-frequency relief structure R (x, y).
- the low-frequency grating structure G (x, y) has a known profile, such as a sinusoidal, rectangular, a symmetric or asymmetric sawtooth-shaped profile, etc.
- the high-frequency relief structure R (x, y) has a spatial frequency fR of preferably at least 2,500 lines per Millimeters up.
- the low-frequency grating structure G (x, y) has a low grating spatial frequency fG of, for example, less than 1000 lines / millimeter.
- the grating spatial frequency fG has a value between 100 lines / millimeter to 500 lines / millimeter.
- the relief profile height hR of the relief structure R (x, y indicates a value from the
- the relief profile height hR is preferably selected from the narrower range of 170 nm to 200 nm.
- the grating profile height hG of the grating structure G (x, y) is greater than the relief profile height hR.
- the grating profile height hG preferably has a value in the range from 250 nm to 500 nm.
- the low-frequency grating structure G (x, y) diffracts the incident light as a function of the grating spatial frequency fG into a plurality of diffraction orders and accordingly produces an optical diffraction effect.
- the high-frequency relief structure serves to orient the liquid crystal material.
- a grating vector of the grating structure G (x) and a relief vector of the relief structure R (x) are aligned substantially parallel.
- FIG. 6c shows a diffractive structure B (x) in which the grating vector and the relief vector in the plane of the coordinates x and y are oriented orthogonal to one another.
- the sinusoidal grating structure G (x) is only a function of the coordinate x, while the sinusoidal relief structure R (y) depends only on the coordinate y.
- the diffractive structure 64 is modulated on the raised surfaces of the rectangular structure having the relief structure R (x), while the diffractive structure 64 is smooth at the bottom of the grooves of the rectangular structure.
- the multiplicative superimposition of the rectangular grid structure G (x) with the relief structure R (y) generates the diffractive structure B (x, y).
- the grating structure G (x) and the relief structure R (y) have the same parameters as in the diffractive structure 63 except for the relief vector pointing in the direction of the coordinate y.
- the films 2 and 3 and the optical security elements 4 and 6 may have further layers in which further optically active diffractive structures are imprinted.
- the further layers may be made of metal in a thin film layer system for the production of Form color shifts by means of interference and / or have reflective properties.
- FIG. 7 shows a stamping foil 7, which consists of a carrier layer 71 and a layer of layers consisting of layers 72, 73, 74 and 75.
- the layer 72 is a protective lacquer layer.
- the layer 73 is a replication layer in which diffractive structures 761, 762 and 763 are impressed.
- the layer 74 is a reflective layer and the layer 75 is an adhesive layer.
- the stamping foil 7 has areas 771 to 774 in which the stamping foil is designed differently.
- the layers 71, 72, 73 and 75 are configured like the layers 21, 22, 23 and 26, respectively.
- Material for the metal layer are essentially chromium, aluminum, copper, iron, nickel, silver or gold or an alloy with these materials in question.
- the reflection layer 74 is formed only partially and pattern-shaped and thus an optical security element is provided with partially transmissive or reflective properties.
- the diffractive structures 761 and 762 are embossed in the regions 771 and 774, respectively, of the stamping foil 7.
- the diffractive structure 763 is in the regions 772, 773 and 774 of the stamping foil 7 embossed into the replication layer 73.
- the diffractive structures 761 and 762, on the one hand, and 763, on the other hand, are impressed on opposite sides into the replication layer 73, the diffractive structures 762 and 763 being superimposed in the region 774.
- the layer 74 is applied only in regions to the replication layer 73, so that the diffractive structure 763 is coated only in the regions 774 and 772 with a layer of liquid crystal material.
- the diffraction effect generated by the diffractive structure 761 comes into play, so that here, for example, a reflective, holographic representation results.
- a polarization representation and a holographic representation, both of which are reflective are generated side by side by the diffractive structure 763, as described, for example, in the exemplary embodiment according to FIG. 6.
- the diffractive optical effect produced by the diffractive structure 762 is superimposed by the polarization effect generated by the layer 74, so that, for example, a holographic representation changes as the direction of polarization of the incident light changes.
- FIG. 8 shows a sticker sheet 8 consisting of six layers 81, 82, 83, 84, 85 and 86.
- the layer 81 is a carrier layer.
- the layers 82 and 85 are replication layers in which diffractive structures 87 and 88 are imprinted.
- the layer 83 is a layer of a liquid crystal material.
- the layers 84 and 86 are adhesive layers.
- the layers 81, 82 and 85, 83 and 84 and 86 are configured, for example, like the layers 31, 32, 33 and 34 of FIG. 3, respectively.
- the sticker film 8 is produced like the sticker film 3 according to FIG. 3. Then, on the film body thus produced, the replication layer 85 having the diffractive structure 88 and the adhesive layer 86 is laminated by, for example, a laminating film.
- the layer 83 is arranged underneath the layer 85, so that the diffractive structure 87 only acts diffraction-optically.
- FIG. 9 shows an optical fuse element 9 consisting of five layers 91, 92, 93, 94 and 95.
- the layer 91 is a replication layer into which a diffractive structure 96 is embossed.
- the layer 92 is a layer of a liquid crystal material.
- the layer 94 is a reflection layer.
- the layers 93 and 92 form a thin-film layer system which generates viewing-angle-dependent color shifts by means of interference.
- the layer 95 is an adhesive layer.
- Layers 91, 92 and 95 are like layers 23, 24 and 26 of FIG.
- the layer 94 is configured like the layer 75 according to FIG. 7.
- the thin-film layer system consists of an absorption layer (preferably with 30 to 65% transmission), a transparent spacer layer as a color change-generating layer (? / 4 or? / 2 layer) and an optical layer Separation layer (formation of a transmissive element) or a reflective layer (formation of a reflective element).
- the thickness of the spacer layer is in this case selected so that the formation of a reflective element fulfills the condition and, when a transmissive element is formed, the condition is fulfilled, wherein is preferably in the range of visible to a human observer light.
- the absorption layer may for example consist of one of the following materials or of an alloy of the following materials: chromium, nickel, palladium, titanium, cobalt, iron, tungsten, iron oxide or carbon.
- an optical separation layer in particular materials such as oxides, sulfides or chalcogenides come into question.
- Critical to the choice of materials is that there is a difference in refractive index over the materials used in the spacer layer. This difference should preferably not be less than 0.2.
- a thin-film layer sequence which generates viewing-angle-dependent color shift by means of interference, from a sequence of high-index and low-index layers.
- the high and low refractive index layers of such a thin film layer sequence each form an optically effective spacer layer which has to comply with the conditions described above. The higher the number of layers selected, the sharper the wavelength of the color change effect can be set.
- it is particularly advantageous to construct such a thin-film layer sequence comprising 2 to 10 layers (even-numbered variant) or 3 to 9 layers (odd-numbered variant). Examples of conventional layers of such a thin-film layer sequence and examples of materials which are principally usable for the layers of such a thin-film layer sequence are disclosed, for example, in WO 01/03945, page 5, lines 30 to page 8, line 5.
- the interference optical effect produced by the thin-film layer system 93 is thus superimposed by the polarization effect produced by the layer 92.
- a viewing-angle-dependent color-changing effect produced by the thin-film layer system 93 thus occurs, for example, depending on the direction of polarization of the incident light, only for a partial area of the optical security element 9.
- the diffractive structure 96 and the layer 92 such as the diffractive structure 68 and the layer 66 according to FIG. 6, and thus to achieve a combination of diffractive effects, diffraction-optical effects and polarization effects.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Security & Cryptography (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Polarising Elements (AREA)
- Credit Cards Or The Like (AREA)
- Laminated Bodies (AREA)
- Liquid Crystal (AREA)
- Communication Cables (AREA)
- Burglar Alarm Systems (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Optical Filters (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06015946A EP1724619B1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches Sicherungselement |
SI200430121T SI1613988T1 (sl) | 2003-04-17 | 2004-04-08 | Folija in opticni varnostni element |
EP06015947A EP1722255B1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches Sicherungselement |
PL04726432T PL1613988T3 (pl) | 2003-04-17 | 2004-04-08 | Folia i optyczny element zabezpieczający |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10318157A DE10318157A1 (de) | 2003-04-17 | 2003-04-17 | Folie und optisches Sicherungselement |
PCT/DE2004/000761 WO2004095090A1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches sicherungselement |
Related Child Applications (4)
Application Number | Title | Priority Date | Filing Date |
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EP06015946A Division-Into EP1724619B1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches Sicherungselement |
EP06015946A Division EP1724619B1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches Sicherungselement |
EP06015947A Division-Into EP1722255B1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches Sicherungselement |
EP06015947A Division EP1722255B1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches Sicherungselement |
Publications (3)
Publication Number | Publication Date |
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EP1613988A1 true EP1613988A1 (de) | 2006-01-11 |
EP1613988B1 EP1613988B1 (de) | 2006-09-06 |
EP1613988B2 EP1613988B2 (de) | 2014-01-22 |
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Application Number | Title | Priority Date | Filing Date |
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EP06015947A Expired - Lifetime EP1722255B1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches Sicherungselement |
EP04726432.0A Expired - Lifetime EP1613988B2 (de) | 2003-04-17 | 2004-04-08 | Folie |
EP06015946A Expired - Lifetime EP1724619B1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches Sicherungselement |
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EP06015947A Expired - Lifetime EP1722255B1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches Sicherungselement |
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Application Number | Title | Priority Date | Filing Date |
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EP06015946A Expired - Lifetime EP1724619B1 (de) | 2003-04-17 | 2004-04-08 | Folie und optisches Sicherungselement |
Country Status (16)
Country | Link |
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US (1) | US7511796B2 (de) |
EP (3) | EP1722255B1 (de) |
JP (1) | JP4768600B2 (de) |
KR (1) | KR101081501B1 (de) |
CN (1) | CN100374885C (de) |
AT (3) | ATE338956T1 (de) |
DE (4) | DE10318157A1 (de) |
DK (1) | DK1613988T3 (de) |
ES (1) | ES2273245T3 (de) |
MY (1) | MY135247A (de) |
PL (1) | PL1613988T3 (de) |
PT (1) | PT1613988E (de) |
RU (1) | RU2328760C2 (de) |
SI (1) | SI1613988T1 (de) |
TW (1) | TWI306516B (de) |
WO (1) | WO2004095090A1 (de) |
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2003
- 2003-04-17 DE DE10318157A patent/DE10318157A1/de not_active Ceased
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2004
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See references of WO2004095090A1 * |
Also Published As
Publication number | Publication date |
---|---|
RU2328760C2 (ru) | 2008-07-10 |
ATE338956T1 (de) | 2006-09-15 |
EP1613988B2 (de) | 2014-01-22 |
JP4768600B2 (ja) | 2011-09-07 |
DE502004010310D1 (de) | 2009-12-10 |
ATE445856T1 (de) | 2009-10-15 |
SI1613988T1 (sl) | 2007-02-28 |
KR20060014376A (ko) | 2006-02-15 |
EP1724619B1 (de) | 2009-10-14 |
CN1791814A (zh) | 2006-06-21 |
US20060251863A1 (en) | 2006-11-09 |
PT1613988E (pt) | 2007-01-31 |
EP1613988B1 (de) | 2006-09-06 |
EP1724619A1 (de) | 2006-11-22 |
ATE447194T1 (de) | 2009-11-15 |
US7511796B2 (en) | 2009-03-31 |
TWI306516B (en) | 2009-02-21 |
CN100374885C (zh) | 2008-03-12 |
WO2004095090A1 (de) | 2004-11-04 |
ES2273245T3 (es) | 2007-05-01 |
RU2005135653A (ru) | 2006-03-20 |
EP1722255B1 (de) | 2009-10-28 |
TW200502579A (en) | 2005-01-16 |
EP1722255A1 (de) | 2006-11-15 |
MY135247A (en) | 2008-03-31 |
DE502004001422D1 (de) | 2006-10-19 |
PL1613988T3 (pl) | 2007-01-31 |
DE10318157A1 (de) | 2004-11-11 |
JP2006525139A (ja) | 2006-11-09 |
DK1613988T3 (da) | 2007-01-15 |
DE502004010249D1 (de) | 2009-11-26 |
KR101081501B1 (ko) | 2011-11-08 |
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